For future reference @genesis, most 500 errors are caused by either file permissions or .htaccess errors. If you upload over SFTP, the file permissions are changed from 644 to something else. You must change these back to 644. After you have done this, if you still get a 500 error, rename your .htaccess to something else. If the website then works, you know it's a problem with your .htaccess.